If you are not sure, assume that an idea is not common knowledge and cite the source. It is much easier to remove a citation than it is to hunt down a citation and try to add it later. Finally, when in doubt, check with your professor.
Taking vitamin supplements will boost your energy level only if you are deficient in them. In particular, our bodies need B vitamins to release the energy in foods. The family of B vitamins includes B1, B2, B3, B5, B6, B7, B12 and folic acid. Taking large amounts won't give you extra energy, however, so it isn't wise to consume more than the recommended daily allowance.
These vitamins help your body transform the food you eat into energy. For the most part, the B vitamins are absorbed directly into the bloodstream in your stomach or small intestines. The exception is vitamin B-12, which must be bound to something called intrinsic factor for absorption.